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Tech Brief CTI: The Comparative Tracking Index Test

Tech BriefCTI: The Comparative Tracking Index TestThe Comparative Tracking Index (CTI) is the maximum voltage, measured in volts, at which a material withstands 50 drops of contaminated water without Tracking . Tracking is defined as the formation of conductive paths due to electrical stress, humidity, and contamination. The CTI test provides an accelerated simulation of conditions of surface discharges and possible resulting Tracking and failure (typically a short ) in equipment using insulating materials. This test also provides a means to compare insulating materials performances under wet and contaminated requirements became important to manufacturers after the publication of the Underwriters Laboratories document UL 1950 in March 1992. UL 1950 is the UL Standard for Safety titled Information Technology Equipment including Electrical Business Equipment. Section of this document outlines requirements for Creepage Distance, which is the shortest path between two conductive parts measured along the surface of the insulation.

Material Group IIIa, when tested to IEC60112 on both sides of tape. (d) Material Group IIIa May be marked “Comparative Tracking Index (CTI) 325(275) on Adhesive side, UL840, Material Group IIIa and/or CTI 225 on Film Side, Material Group IIIa or equivalent when tested to IEC60112, 4th Edition (2003).

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